6. lecture 5 cadastral maps

Cadastral Survey
Lecture 5 Cadastral Maps

Lecture Objective
 After completing this unit the students are
expected to
– Understand different spatial data source for cadastral
mapping
– Identify the content of cadastral map
– Identify the attribute or layer of cadastral maps
– Understand the functions of cadastral maps

Cadastral Map
 Cadastre map: is a technical term for a set of
records showing the extent or size, value and
ownership (or other basis for use or
occupancy) of land.
 Generally ,Cadastral Maps help determine the
location of property, indicate the size and
shape of each parcel and reveal geographic
relationships that affect property value.
3

Cadastral map
 Usually cadastral maps need only be “Planimetric”
maps, that is to say, they need not show
topographical relief.
4 Figure 6-3 Cadastral Plan showing boundaries of land ownership

Topographic map
 Such maps make it possible to show accurately
the position of roads, railways, footpaths,
villages, rivers, streams, bridges, important
buildings, administrative boundaries and other
similar features as well as the relief of the land.
 The maps with which most people are familiar
are topographic maps at scales of around
1:50,000.
5

City maps categorized into three:
1. city base map is the original map of the city prepared
from actual field surveying or photogrammetric plots.
• It contains complete Planimetric and vertical
information and may consist of several overlays.
1. Derived maps are basically similar in content to the city
base map but are usually at smaller scales; they are
derived from the base map and use a certain
generalization in presentation. Reduction to required
scales, such as 1:5000 and 1: 10000, may be done
photographically or by other, cartographic means.
2. Thematic maps include maps not listed in category 1
or 2. Usually, they are single-factor maps providing, on
a reference background, quantitative or qualitative
information on the phenomenon in question.

Spatial and Non Spatial Data Sourse
 Land Information System is an automated
development of Cadastral Mapping.
 In general there are two main topic of concern for
setting up a land information system (LIS).
1. Spatial data or Survey data:- describing the
spatial disposition or character of the parcels in
the real world.
2. Non-Spatial data source:- describing details
such as ownership details, tax value etc.
– Legal Information
7

Spatial-Data source
 Aerial Images
 Satellite Images
 Ground measurement by total station
 Ground measurement by GPS
 Existing analog maps

Non Spatial-Data Source
 Legal documents: such as Ownership,
Taxation, Land value, Parcel-identifiers, Street
addresses, Buildings type, House numbers,
Land use,
 Field observation
 Sample
 Questioner
 Report
 Census Figures

Layers of Cadastral MAP
 Topographic layers
 Vegetation layers
 Road layers
 Transportation layers: Air strip, Public transport
lines, Terminals,
 Utility layers
 Built-Up area layer: Blocks, Parcels, Buildings,
Fences
 Jurisdiction layers: Administrative/town
boundary, District boundary if there is Kebele

Scale of Cadastral Maps
 Cadastral maps are a series of large scale
maps showing property boundaries, building
and structures on the land and major natural
features and provide cartographic land survey
and land ownership records.
 It facilitates the administration of lands which
assists in the valuation and taxation of land.

Accuracy of Geo-spatial Data
 Accuracy of map data is the degree toward
which any given feature(s) on a map conforms to
its true position on the ground.
– Horizontal Accuracy /positional according the National
Mapping - EMA = -/+ 30cm (at the scale of 1:2,000)
– Vertical Accuracy- EMA standard is = 0.25 or
¼ of the contour interval – 1:500 -0.5m,
1:1000m -1m, 1:5000 - 2m, 5m.

Designing a Cartographic Map
Map Layout
 Map layouts can be portrait or landscape according to the shape of
the area.
 The placement of the map should be such that it does not interfere
on the other map
Map Title
 The map title should be set in large bold text to stand out from other
annotation on the map.
 It should be placed in such a way as not to be confused with other
map text.
 The lettering size can be adjusted to suit the map size and to
accommodate long titles.
Orientation
 As a general rule, orientation should be north-south with north at the top of
the page.
 Show a north arrow

Map Extent or size
 Information should be shown up to the neat line of the map,
 Plan the scale of your cadastral map having in mind the way to
represent clearly the smallest property;
Map Sheet Size
 A uniform size for map sheets facilitates handling and storage of
maps.
 75x75 cm, 80x60 cm, 80x64 cm, A0,A1, A2, A3, A4
North Arrow
 Use a north arrow consistent in size, colour and style
 Place it above the scale bar
Scale Bar
 Representative fraction e.g. 1:50 000 is essential in addition to
scale bar

Legend
 All features on a map must be explained in the legend
 The map legend should be clearly separated from the map.
Logos
 Place logos of the respected municipal towns in the map legend area.
 Avoid reducing logos to such an extent that they are illegible.
Sheet Number/Parcel numbering
 A parcel identification system provides a method for referencing land
parcels, or data associated with parcels, using a number or code instead of
a complete legal description.
 The correlation of maps and individual property records requires that all
parcel files be indexed using a uniform parcel identifier.
 Index map
 Separate any index map clearly from the main map.
 Use sparse labelling, but sufficient for orientation.
 Use a north arrow (if necessary) and a scale bar.

UPIN
The UPI should contain:
o Region code 2 digits= text;
o City/Town code 3 digits = number;
o Sub city code 2 digits=number (if it is not
applicable 00)
o Block number code 3 digits = number;
o Parcel number code 4 digits = number;
16

UPIN
 The same procedure proceeds for condominium
houses, but it should be extended to 20 digits as
follows:
o Condominium block /building unit code =2 digits
of number
o Condominium floor code =2 digits of number
o Condominium house code=2 digits of number
17

Region codes
1) Addis Ababa = AA
2) Afar Regional Government = AF
3) Amhara Regional Government = AM
4) BenishangulGumuz Regional Government = BG
5) Dire Dawa City Administration= DD
6) EthioSomale Regional Government= SO
7) Gambela Regional Government = GA
8) Harrari Regional Government = HR
9) Oromiya Regional Government = OR
10) Southern Nations, Nationalities & People Regional Government = SN
11) Tigray Regional Government= TG

Projections and Coordinate Systems
 Projection – Universal Transverse Mercator ,
 Reference Ellipsoid - Clarke1880,
 Local Geodetic Datum – Adindan
 Unit – Meters,
Parameters
 a) UTM Grid Zone - 37,
 b) Central Meridian - 39º E,
 c) False Easting – 500,000 m E
 d) False Northing – 0 m N
 e) Scale Factor - 0.999

Discussion Question
1. Can you describe the content of cadastral maps?
2. Discuss how the north arrow is important for
cadastral mapping?
3. Can you briefly explain some of the guidelines for
cadastral mapping preparation?
4. Can you describe the function of cadastral maps?
5. Discuss how cadastral map facilitate for land tax
and land valuation?

6. lecture 5 cadastral maps

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6. lecture 5 cadastral maps